CN102240676B - Rolling device for preparing high-toughness high-formability magnesium alloy sheet strip coil - Google Patents
Rolling device for preparing high-toughness high-formability magnesium alloy sheet strip coil Download PDFInfo
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- CN102240676B CN102240676B CN 201110121177 CN201110121177A CN102240676B CN 102240676 B CN102240676 B CN 102240676B CN 201110121177 CN201110121177 CN 201110121177 CN 201110121177 A CN201110121177 A CN 201110121177A CN 102240676 B CN102240676 B CN 102240676B
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Abstract
The invention relates to a rolling device for preparing a high-toughness high-formability magnesium alloy sheet strip coil and belongs to the field of metal material rolling. The rolling device provided by the invention comprises a rolling machine, an uncoiling machine, a left-right recoiling machine, a front online heating insulating device of the roll machine, a rear online heating insulating device of the roll machine, a straightening machine, a bending rectifying machine, a thickness measuring device, a steering tension roll, a guide roll, a roller heating and lubricating device and the like. In the invention, an online continuous heating device and an advanced PLC (programmable logic control) feedback control system are adopted, and continuous temperature control rolling on the magnesium alloy strip coil is realized. The rolling device provided by the invention has the advantages of uniform heating temperature, high heating efficiency and high temperature control accuracy, and high-quality thin wrought magnesium alloy strip coils are efficiently produced by virtue of a roller preheating insulating system, a technical lubricating system, a strip shape control system and a tension straightening device, thus the geometric quality and structure properties of rolled metal can meet operating requirements.
Description
Technical field
The present invention relates to magnesium alloy rolling and be shaped, particularly the thin coiled stock rolling device of magnesium alloy strip coil base.
Background technology
Magnesium alloy sheet roll coil of strip rolling deformation belongs to magnesium alloy deep processing industry, is new material industry and encourage growth project that country supports.The rolling magnesium alloy board of high-performance is the main material of directly making or becoming to have through processing and forming the fine structure part of multiple functions such as conduction, heat radiation, damping, noise control, energy-conservation, lightweight, mainly for the production of electronics and IT products (as computer, communication, consumption electronic product etc.) housing, automotive electronics shell, framework, instrument board, household electrical appliances and war products etc.Compare with moulding process such as magnesium alloy extruding at present commonly used and die casting, the rolling deformation magnesium alloy is because strengthening mechanisms such as grain refinements, make material possess higher intensity, better plasticity and toughness and diversified mechanical property, can satisfy the shaping demand of more structural members, production efficiency height and cost are very low, and comprehensive advantage is fairly obvious.Rolling and the forming technique of wrought magnesium alloy thin plate and band volume belongs to international forward position manufacturing technology.There is superior magnesium alloy resource in China and to the demand in high-performance, high formability magnesium alloy strip coil market, the core technology that independent research magnesium alloy thin plate and band roll bending is produced, and with its commercial application, for promoting China's magnesium level of industry, promoting China's non-ferrous metal magnesium alloy industrial upgrading and technological progress to have most important theories and practical significance.
Magnesium alloy is to use the lightest structural metallic material at present, and density is approximately 1.74g/cm3, is 1/4 of steel, 2/3 of aluminium; Compare with aluminium alloy with steel, magnesium alloy not only has higher specific strength and specific stiffness, and having good heat dispersion, capability of electromagnetic shielding, damping performance and machining property, its product is easy to be recycled, is expected to become important commercial lightweight structural material of 21 century.Magnesium and magnesium alloy board section product are widely used in fields such as Aeronautics and Astronautics, automobile, computer, communication, household electrical appliances and national defence industry.
In state-owned abundant magnesium resource, rank first in the world, account for more than 60% of world's gross reserves.Also be automobile, motorcycle and communication product enormous and latent market simultaneously, have the advantageous condition of development magnesium alloy.But Application of Magnesium is scarcely out of swaddling-clothes, though former magnesium output occupies first place in the world, mostly with primary exporting, magnesium alloy is used few, with developed country such as American-European-Japanese very big gap is arranged.
Traditional magnesium-alloy material mainly obtains (comprising conventional cast technology and novel technologies such as die casting) by the mode of production of casting.Casting back magnesium alloy in following process, the amount of plastic deformation that can bear and the time deformation velocity all very low, cracking has very easily had a strong impact on the suitability for industrialized production of magnesium alloy.Therefore, present most of magnesium alloy product adopts die casting, semi-solid casting making method to produce, and because magnesium is the close-packed hexagonal metal, slip system is few, the plastic deformation difficulty, in face of till method processing such as less employing production efficiency height, forging that performance quality is good, rolling and extruding.Because the magnesium alloy crystal grain that casting is produced is tiny inadequately, has component segregation, can not fundamentally solve work brittleness and etching problem, is difficult to prepare the magnesium alloy of function admirable.
Analyze theoretically, deformed magnesium alloy material is because crystal grain obtains refinement, solved the segregation problem of material, has the irreplaceable excellent in performance of founding materials, therefore the wrought magnesium alloy product that goes out by extruding, forging, explained hereafter such as rolling, have higher intensity, better ductility, more diversified mechanical property than founding materials, can satisfy the demand of more structural members.Yet, magnesium alloy is carried out conventional plastic deformation, particularly the research of high efficiency thin plate roll coil of strip rolling mill practice also is in the starting stage, the thin plate roll coil of strip of deformed magnesium alloy (0.5mm is following) also all can not carry out large-scale production at present, the mass production of stamping parts is yet very difficult, thereby is difficult to the premium properties of wrought magnesium alloy is widely used.
The main cause of restriction deformed magnesium alloy extensive use is its relatively poor room temperature forming.Though magnesium alloy can easily carry out the hot rolling of hot extrusion and slab, but the rolling lumber recovery of the thin plate roll coil of strip that 0.5mm is following is very low, and rareer to satisfied deep drawability, reason is that magnesium is the close-packed hexagonal structure metal, its axial ratio c/a=1.624 particularly is near desirable axial ratio c/a=1.63.Make most of magnesium alloy materials generally can only carry out plastic deformation by basal slip and twin, independent slip system is few, is difficult to six side's metal Ti, Zr as low axial ratio, shows good plasticity by cylinder, the common slippage of faceted pebble.So most of magnesium-alloy materials can only be produced by casting and hot extrusion.In addition, the domestic magnesium alloy board mode of production has limited productivity ratio and properties of product stability.If can improve the plastic deformation ability, particularly deep drawing quality of magnesium alloy largely, then can fundamentally change the cheap former magnesium of outlet of China and the unfavorable situation of transition loss resource.Produce the magnesium alloy sheet band, then can be used to directly make or be made into through processing and forming and have conduction, heat radiation, damping, noise control, the fine structure part of multiple function such as energy-conservation.These parts are in automobile, household electrical appliances, communication, electronic information, sports equipment, and departments such as robot, national defence have wide practical use.
Because the premium properties of wrought magnesium alloy, development and exploitation wrought magnesium alloy product, produce high-quality strip (volume) section product and follow-up stamping products and the product with anti-corrosion wear-resistant surface, the new technology of formulating wrought magnesium alloy production is a long-term goal of the exploitation magnesium-alloy material that proposes of international magnesium association, magnesium-alloy material is obtained to use widely to have great importance, and also is very necessary.
Along with China's economic development, auto industry, electronic product are progressively becoming the mainstay of China's economic development, because lightweight, the energy-saving and environmental protection characteristic of magnesium alloy structural part, the operation technique of development magnesium alloy is the key of walking sustainable development path in automobile and electronic product.Reaching the High-efficient Production of magnesium alloy and the high-performance of product then is the key that magnesium alloy uses.Theory and the technical study of carrying out the magnesium alloy sheet efficient production have important theory and practice significance for this reason.
Summary of the invention
The deformation temperature interval that the present invention allows when rolling for the solution magnesium alloy thin plate and band twists in is little, more and more faster with roll coil of strip attenuate temperature drop, can't guarantee enough rolling temperatures, can not carry out plate shape, the uppity difficult point of thickness of slab precision of heat/warm-rolling and thin coiled stock continuously, by at the roller-way of milling train entrance and exit both sides online heating and attemperator being installed, when making magnesium alloy thin coiled stock rolling, remain required homogeneous deformation temperature; Realize rolling production by the power that parts a little the control to the forward and backward coiling machine of milling train; Unit also adopts the roll constant temperature heating device to keep the gentle roll forming of roller stable; Because the sensitiveness of magnesium alloy flow harden is very big, coercivity is very high, is difficult to leveling under the low temperature, and the present invention realizes that by tension force control plate shape is good by at the forward and backward temperature correction direct sum temperature stretch bending device of straightening that adopts respectively of coiling machine; Also control automatically by calibrator realization thickness of slab is installed before and after milling train, guarantee the thickness and precision of strip; Milling train adopts the asymmetrical rolling technology of the independent transmission of working roll, is conducive to magnesium alloy deformation and rolls thin and grain refinement, improves the structure property of band; Unit also adopts proprietary lubrication technology to improve the surface quality of band; Thereby the Rolling Production technology of high tough, the high formability magnesium alloy sheet roll coil of strip that the plate shape, thickness, surface quality and the structure property that realize the 0.2mm roll coil of strip are good satisfies and produces in enormous quantities and expansion magnesium alloy demands of applications.
A kind ofly prepare high tough, rolling device that the high formability magnesium alloy sheet roll coil of strip is used, comprise uncoiler 1, coil opener 2, guiding pinch roll 3, the first guiding jockey pulley 4, smoothing roll 5, the first online heater 6, first calibrator 7, first roll heating lubricating arrangement 8, milling train 9, second roll heating lubricating arrangement 10, second calibrator 11, the second online heater 12, stretch bending device of straightening 13, the second guiding jockey pulley 14, first coiling machine 15, second coiling machine 16.Uncoiler 1, coil opener 2, guiding pinch roll 3, the first guiding jockey pulley 4, smoothing roll 5, the first online heater 6, first calibrator 7, first roll heating lubricating arrangement 8 and second coiling machine 16 are at milling train 9 front ends, and second roll heating lubricating arrangement 10, second calibrator 11, the second online heater 12, stretch bending device of straightening 13, the second guiding jockey pulley 14, first coiling machine 15 are in milling train 9 rear ends.
Band is pushed ahead, through guiding pinch roll 3, enter the first guiding jockey pulley 4, entering straightener 5 again aligns, enter the first online heater 6 behind the aligning and carry out the online heating of band, enter first calibrator 7 after the heating and carry out the measurement of supplied materials thickness, again through first roll heating lubricating arrangement 8, entering main mill 9 is rolled, through second roll heating lubricating arrangement 10, enter the measurement that second calibrator 11 is rolled thickness after rolling, enter second online heater 12 heating again, through stretch bending device of straightening 13 alignings and the second guiding jockey pulley 14, enter first coiling machine, behind the winding strips 2-3 circle, unit heating and increasing speed rolling.Be rolled down to magnetic tape trailer on uncoiler one reel only during remaining 3-4 circle, unit slows down rolling, and before magnetic tape trailer entered the first guiding jockey pulley, unit stopped rolling.
Finish first passage rolling after, milling train 9 and first coiling machine 15 carry out reverse rotation subsequently, begin oppositely rollingly, the magnetic tape trailer after simultaneously first passage is rolling is sent into second coiling machine 16, behind the winding strips 2-3 circle, unit heating and increasing speed rolling.Band carries out back and forth rolling according to technological parameters such as the technological temperature of setting and roll gap at second coiling machine 16, milling train 9 and 15 of first coiling machines, until the target thickness that is rolled down to setting.
Uncoiler 1 is positioned at before the coil opener 2, is used for finishing together with coil opener beginning, the uncoiling feeding process of roll coil of strip base.Guarantee in the uncoiling operation of rolling band is produced rolling required tension force, and can carry out band centering roll coil of strip width centreline is overlapped with the maintenance of unit center line.
First coiling machine 15, second coiling machine 16 be used for winding strips, set up tension force carries out stable rolling.
Online heater 6 and the 12 pairs of rolling magnesium alloy strips heat and are incubated, to satisfy milling train 9 rolling required temperature ranges.The online thermal recovery induction heating apparatus that adds can carry out real-time FEEDBACK CONTROL heating or insulation by thickness, width and the speed of service of band according to the temperature of rolling demand.
The roll coil of strip after milling train 9 is used for heating passes through the rolling of some passages, finally rolls into the band of desired thickness.This milling train is the independent transmission of working roll, by the control to up-down rollers speed band is realized asymmetrical rolling, thereby reaches the purpose of crystal grain thinning.The unit milling train can be four rollers, six rollers or multiple roll, also can adopt four or five tandem rolling units compositions.
This milling train can be according to different strip width, the different bending roller force of thickness setting, and regulates bending roller force and good to guarantee band plate shape by the adjusting of roll heating and lubricating arrangement 8 and 10 etc. in rolling.Simultaneously milling train is provided with all-hydraulic automatic gauge control system, realizes feedforward and the FEEDBACK CONTROL of thickness by milling train 9 front and back calibrators 7,11 actual measurement thickness of strip, to reach the thickness and precision of setting.
The first guiding jockey pulley 4 and the second guiding jockey pulley 14, guide band to turn to, assist coiler mandrel feeding and measurement roll coil of strip speed to the left and right on the one hand, realize parting a little force feedback control by the tensometer of installing on the other hand, thereby guarantee that rolling smooth distortion and control panel shape are good.
Realize that for better plate shape is good, realize online heating finishing by straightener 5 and 13 pairs of final passes of stretch bending device of straightening before and after the milling train, thereby eliminate the bad phenomenon of plate shape that rolling strip causes.Milling train 9 guarantees that by adopting advanced lubricating process roll coil of strip surface quality is good.
Characteristics of the present invention are to adopt the on-line continuous heater, adopt advanced PLC feedback control system, can realize the continuous temperature-controlled rolling of the magnesium alloy plate roll coil of strip, in the operation of rolling, according to supplied materials state and technological requirement stocking is heated or be incubated, make it to remain on the required temperature range of magnesium alloy deformation, have the advantage that heating-up temperature is even, the efficiency of heating surface is high and temperature-controlled precision is high, thereby make the operation of rolling be carried out smoothly; Purpose by asymmetrical rolling realization crystal grain thinning is improved comprehensive mechanical performance; Automatically control the thickness and precision that guarantees thin strip by heat tracing and temperature FEEDBACK CONTROL, thickness; By roll preheating insulation system, process lubrication system, realization plate shape such as plat control system, tension straightening device and surface quality are good, thereby produce the high-quality deformed magnesium alloy tape volume of being with as thin as a wafer expeditiously, make geometry quality and the structure property of stocking satisfy instructions for use.
Left and right sides coiling machine adopts the mode of air cooling, is conducive to avoid that temperature retention time is long causes growing up of rolled strip crystal grain on the one hand, is conducive to improve the performance of stocking; Be conducive on the other hand as thin as a wafer with coil rolling, cause the generation of accidents such as broken belt when avoiding Yin Wendu higher because of tension variation, what be conducive to technology carries out and improves lumber recovery smoothly, also saves the energy simultaneously widely.
Effect by the guiding jockey pulley realizes that rolling magnesium alloy strip coil is parted a little power to be measured, cooperate between coiling machine and milling train and form certain force of strain, realization is to the power that parts a little the control of thin strip, can cooperate to utilize with the strong unit of stretch bending again simultaneously the heating band is carried out the control of plate shape and processing, thereby avoid the thin coiled stock stretch bending of heating is again rectified to handle the bad problem of plate shape that causes owing to reason such as rolling, thereby also save energy consumption greatly.
Description of drawings
The rolling device schematic diagram that Fig. 1 is tough for the preparation height, the high formability magnesium alloy sheet roll coil of strip is used.
Uncoiler 1; Coil opener 2; Guiding pinch roll 3; The first guiding jockey pulley 4; Smoothing roll 5; The first online heater 6; First calibrator 7; First roll heating lubricating arrangement 8; Milling train 9; Second roll heating lubricating arrangement 10; The 2nd calibrator 11; The second online heater 12; Stretch bending device of straightening 13; The second guiding jockey pulley 14; First coiling machine 15; Second coiling machine 16.
The specific embodiment
The uncoiler 1 of will the rolling roll coil of strip packing into rotates uncoiler to wear tape speed, simultaneously and coil opener 2 finish beginning, uncoiling, the straight peen feeding process of magnesium alloy strip coil base together.Guarantee in the uncoiling operation of rolling band is produced rolling required tension force, and can carry out band centering roll coil of strip width centreline is overlapped with the maintenance of unit center line.
Band is pushed ahead, through guiding pinch roll 3, enter the first guiding jockey pulley 4, entering straightener 5 aligns, enter the first online heater 6 and carry out the online heating of band, enter first calibrator 7 and carry out the measurement of supplied materials thickness, through first roll heating lubricating arrangement 8, enter main mill 9 and be rolled, adorn 10 through second roll heating is lubricated after rolling, be rolled the measurement of thickness through second calibrator 11, enter the second online heater 12, through stretch bending device of straightening 13 alignings, through the second guiding jockey pulley 14, enter first coiling machine, behind the winding strips 2-3 circle, unit heating and increasing speed rolling.Be rolled down to magnetic tape trailer on uncoiler one reel only during remaining 3-4 circle, unit slows down rolling, and before magnetic tape trailer entered the first guiding jockey pulley, unit stopped rolling.
Finish first passage rolling after, milling train 9 and first coiling machine 15 carry out reverse rotation subsequently, begin oppositely rollingly, the magnetic tape trailer after simultaneously first passage is rolling is sent into second coiling machine 16, behind the winding strips 2-3 circle, unit heating and increasing speed rolling.Band carries out back and forth rolling at second coiling machine 16, milling train 9 and 15 of first coiling machines according to technological parameters such as the technological temperature of setting and roll gap, until the target thickness that is rolled down to setting, after finishing the whole operation of rolling, the roll coil of strip is taken off from first coiling machine (or second coiling machine), begin the rolling of next roll coil of strip.
In the whole operation of rolling, carry out the isothermal heating according to mill speed, thickness of strip and the width of the roll coil of strip, part power control a little according to the thickness of band, carry out thickness feedforward and FEEDBACK CONTROL according to the measured value of calibrator; Rectify unit according to the plate shape breaker roll temperature of rolled strip and lubricated, straightener and stretch bending and control, realize that thickness of slab, plate shape and surface quality are good.By the speed of control up-down rollers stocking is carried out asymmetrical rolling according to operating modes such as rolling thickness, temperature, thereby be conducive to band attenuate and grain refinement, thereby improve the comprehensive mechanical property of stocking.
Claims (4)
1. one kind prepares high tough, the rolling device that the high formability magnesium alloy sheet roll coil of strip is used, its feature comprises: uncoiler (1), coil opener (2), guiding pinch roll (3), the first guiding jockey pulley (4), smoothing roll (5), the first online heater (6), first calibrator (7), first roll heating lubricating arrangement (8), milling train (9), second roll heating lubricating arrangement (10), second calibrator (11), the second online heater (12), stretch bending device of straightening (13), the second guiding jockey pulley (14), first coiling machine (15) and second coiling machine (16); Uncoiler (1), coil opener (2), guiding pinch roll (3), the first guiding jockey pulley (4), smoothing roll (5), the first online heater (6), first calibrator (7), first roll heating lubricating arrangement (8) and second coiling machine (16) are at milling train (9) front end; Second roll heating lubricating arrangement (10), second calibrator (11), the second online heater (12), stretch bending device of straightening (13), the second guiding jockey pulley (14) and first coiling machine (15) are in milling train (9) rear end;
Band is pushed ahead, through guiding pinch roll (3), enter the first guiding jockey pulley (4), entering straightener (5) again aligns, enter the first online heater (6) behind the aligning and carry out the online heating of band, enter first calibrator (7) after the heating and carry out the measurement of supplied materials thickness, again through first roll heating lubricating arrangement (8), entering main mill (9) is rolled, heat lubricating arrangement (10) through second roll after rolling, enter second calibrator (11) and be rolled the measurement of thickness, enter the heating of the second online heater (12) again, through stretch bending device of straightening (13) aligning and the second guiding jockey pulley (14), enter first coiling machine, behind the winding strips 2-3 circle, unit heating and increasing speed rolling; Be rolled down to magnetic tape trailer on uncoiler one reel only during remaining 3-4 circle, unit slows down rolling, and before magnetic tape trailer entered the first guiding jockey pulley, unit stopped rolling;
Finish first passage rolling after, milling train (9) and first coiling machine (15) carry out reverse rotation subsequently, begin oppositely rollingly, the magnetic tape trailer after simultaneously first passage is rolling is sent into second coiling machine (16), behind the winding strips 2-3 circle, unit heating and increasing speed rolling; Band carries out back and forth rolling between second coiling machine (16), milling train (9) and first coiling machine (15) according to technological parameters such as the technological temperature of setting and roll gap, until the target thickness that is rolled down to setting.
2. the rolling device that preparation height as claimed in claim 1 is tough, the high formability magnesium alloy sheet roll coil of strip is used is characterized in that this device is controlled the thickness and precision that guarantees thin strip automatically by heat tracing and temperature FEEDBACK CONTROL, thickness.
3. the rolling device that preparation height as claimed in claim 1 is tough, the high formability magnesium alloy sheet roll coil of strip is used is characterized in that this installs the mode that first, second coiling machine adopts air cooling.
4. the rolling device that preparation height as claimed in claim 1 is tough, the high formability magnesium alloy sheet roll coil of strip is used, it is characterized in that, this device realizes that by the effect of guiding jockey pulley rolling magnesium alloy strip coil is parted a little power to be measured, cooperate between coiling machine and milling train and form certain force of strain, realization is to the power that parts a little the control of thin strip, simultaneously can rectify unit with stretch bending again and cooperate to utilize and carry out the control of plate shape and handle the heating band, stretch bending is rectified to handle because the rolling bad problem of plate shape that causes thereby avoid thin coiled stock heated again.
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| CN 201110121177 CN102240676B (en) | 2011-05-11 | 2011-05-11 | Rolling device for preparing high-toughness high-formability magnesium alloy sheet strip coil |
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| CN 201110121177 CN102240676B (en) | 2011-05-11 | 2011-05-11 | Rolling device for preparing high-toughness high-formability magnesium alloy sheet strip coil |
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| CN102240676B true CN102240676B (en) | 2013-07-03 |
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Effective date of registration: 20230718 Address after: No. 16, Fazhan Avenue, Suyu District, Suqian, Jiangsu Province 223899 Patentee after: Jiangsu Yongliang Magnesium Industry Technology Co.,Ltd. Address before: 100083 Beijing city Haidian District No. 30 Xueyuan Road Beikeda Department of science and technology Patentee before: University OF SCIENCE AND TECHNOLOGY BEIJING |